Last week, Valentino's partner Giancarlo Giammettiposted an old pic of the late royal on Instagram in honor of TBT. In the vintage shot, Diana flashes some skin in a two-piece bikini with a purple shirt over it and big sunglasses while standing on a yacht next to a boy who looks like he could be a young Prince William.

Will, if it is indeed him, would have been six years old at the time; the boy flashes a giant smile while in colorful swim trunks.